Great question! All shirts are designed to be breathable, move with you, and take you from day to night, seamlessly. How each shirt does so differs.
The Aero Dress Shirt is is a woven, synthetic, nylon blend fabric with a brushed inner lining that uses 2-way stretch and has laser cut ventilation holes in the underarms.
The Apollo 3 Dress Shirt is a knit, synthetic blend fabric that uses 4-way stretch and our PCM technology. This will also have the most modern/performance hand-feel of all the shirts.